To the best of our knowledge, no study has reported the simultaneous determination of UA and FA by using the pre-anodized inlaying ultrathin carbon paste electrode (PAIUCPE). In the present work, the nichrome was adopted as a substrate and its one end was rubbed in the carbon paste to fabricate an inlaying ultra-thin carbon paste electrode (IUCPE). The prepared IUCPE was anodized by successive cyclic voltammetry to fabricate the PAIUCPE. It exhibited an excellent electrocatalytic activity for the oxidation of UAand FA, and their oxidation peak potential difference was about 324 mV that was greater than 280 mV and quite close to 330 mV and 340 mV. Compared to the above modified electrodes, the PAIUCPE was made by the simple and fast electrochemical pretreatment of carbon paste electrode that was used conventional
preparation methods.